Improvement in steam and air brakes



HORACE H. TAYLOR, OF VVARSAW, AND ALBERT MCCAMISH, OF- EAST ST.

LOUIS, ILLINOIS, ASSIGNOBS TO JOHN F. DEGNON, OF ST. LOUIS, MIS- SOURI, AND O. D. LEET, OF. SPRINGFIELD, MASSACHUSETTS.

IMPRQVEMEKNT In STEAM AND AIR BRAKES.

Spcciiication forming part of Letters Patent No. lfhlll?, dated April 3,1877.; applicationtiled v August 11, 1876.

To all whom it may concern:

Be it known that we, HORACE H. TAYLOR, of Warsaw, county of Hancock,'and State of lllinois, and ALBERT MoGAM1sH,of East St. Louis, county of St. Clair, and State of Illinois, have invented certain new` and useful Improvements in Steam-Actuated Car-Brakes, of which the following is a specification Our invention relates to that class of carbrakes in which steam is conducted back to a brake-operating cylinder beneath each car by a pipe from the engine, but more especially1 to -that class of brakes in which air compressed der, and escapes from the end of said cylinder at which it entered directly through a pipe, without passing back to the escape at the engine.

The object ot' our invention is to allow the steam or air, after it has been used to force the piston in the brake-operating cylinder to one of its ends, to have free communication with the other end of said brake-operating cylinder, passing back to the escape at the engine, and establish an equilibrium of pressure on the piston, in order to relieve the brakes immediately or more effectually, and to prevent dust or dbris from being drawn into the brake-operating cylinder.

Figure lis a vertical sectional View of a device embodying our invention. Fig. 2 is a transverse view of Fig. 1 at a: x.

A is the brake-operatin g cylinder 5 B, the piston, and C the piston-rod, constructed in the usual manner, for transmitting the power ofthe compressed air inthe cylinder A'to the car-brakes. a is the usual opening of the accurately the valve-seat m".

cylinder A, to allow the air to escape as the piston B is driven forward to apply the brakes. D is an opening, to left-hand' end of which is attached one end of the branch pipe, which leads to conducting-pipe from the engine. E is a pipe leading from olie end of the'valvecaso to frontend of cylinder A, and connects their interiors. G is a pipe, extending 'outward from the usual relief-opening a in the cylinder A, and connecting with our improvement at r. J is a hollow piston-valve, fitting ing in hollow piston-valve7 for the transmission of air from branch pipe D to conductingpipe E, and so on into cylinder A. y is wingvalve in hollow piston-valve, with valve-seat at o in plug n. L is a spiral spring, holding hollow piston-valve J in position, as shown in drawing. a is a leather packing-ring, to exclude the air from passing between the hollow piston-valve and case R, and held in position by plug a. d is a slide-valve, held in position by wings p, as shown in detached sec-- tional view No. 2. b are exhaust-ports in case R, whereby the air escapes from back end of cylinder A through the pipe G, when the air is applied at D. v 1 A The operation of our invention is as follows By means of any ordinary devices the compressed air or steam is allowed to pass from its containing-reservoir, through the main pipe a a and branch pipe, to the opening D, entering which, as shown by the single-headed arrows, it will pass through the hollow piston-valve J to the right, as shown by full lines, and, entering the opening to the pipe 'E to the cylinder A, and driving the piston B to the position shown by full lines, thus projects the piston-rod C, which is connected with the brake-levers, and by said movement operates them. The air in front of advancing'piston B, during said lforward movement thereof, passes freely out through the pipe G, and escapes at exhaust-ports b, as shown by doubleheaded arrows, the hollow piston-valve J rew maining in position, as shown in drawing, until the moment the pressure at the engine is cut oft' and the back pressure or flow conimences 5 then the air-pressure in the cylinder F is an open- A returns through pipe E and into hollow piston-valve J, closing valve y", and pressing hollow piston-valve J back to the left, the

slide-valve d closing the exhaust-ports f, allowing the air to pass around the end of valve m and between wings 19, as shown by dotted arrows, and passes through pipe Gr into back end of cylinder A, thus establishing uninterrupted coinmunication between the interior ends of cylinder A, as shown by the dotted-line arrows, and thus equalizing the pressure of the air on both sides of the piston.

We do not claim, broadly, a hollow pistonvalve with a supplemental valve working therein.

We claim as new and desire to secure by Letters Patent- The combination of the valve case or shell B, with its eduction-ports b" 11; the hollow HORACE H. TAYLOR. A. MGGAMISH. Witnesses:

G. W. GUNNIsoN, OHAs. H. HoUs'roN. 

